In this section, we cover the different built-in Prompty Invokers and walk you through how you can build your own custom invoker.

1. Prompty invokers

The Prompty runtime comes with a set of built-in invokers that can be used to execute external models and APIs. Invokers trigger a call to a the different models and return its output ensuring standardization when it comes to handling models. The invokers currently supported are:

1. azure: Invokes the Azure OpenAI API
2. openai: Invokes the OpenAI API
3. serverless: Invokes serverless models (e.g. GitHub Models) using the Azure AI Inference client library (currently only key based authentication is supported with more managed identity support coming soon)

TODO: Explain how invokers work and how to build a custom invoker

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